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HomeCybersecurity 101
What is DDoS?

What is a DDoS Attack?

Written by: Monica Burgess

Published: 9/5/2025

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A denial-of-service (DoS) attack is a cyber tactic used to overwhelm a system or network, making it unavailable to users. When multiple systems work together to carry out this attack, it’s called a distributed denial-of-service (DDoS) attack.

How Do DDoS Attacks Work?

Picture this: you’re trying to enter a building, but a crowd of people blocks the entrance. That’s essentially what a DDoS attack does to a website or network. Hackers flood a target with so much traffic that it can’t handle the load, crashing it or significantly slowing it down.


To pull this off, attackers often use a "botnet" (a network of infected devices under their control). These bots act collectively, bombarding the target with fake requests until legitimate users are locked out. It’s chaos by design.

What’s the Difference Between DoS and DDoS?

The primary distinction lies in scale and execution:

  • DoS Attack: Perpetrated by a single source.

  • DDoS Attack: Comes from multiple devices, making it harder to detect and block.

While both cause disruption, DDoS attacks are more powerful and harder to defend against due to their distributed nature.

Why Are DDoS Attacks a Big Deal?

Here’s the damage they can do:

  • Downtimes Galore: Interrupt essential services, costing businesses thousands or even millions of dollars per hour.

  • Brand Reputation: Customers lose trust when websites or platforms are repeatedly unavailable.

  • Cover for Bigger Attacks: DDoS attacks can be a smokescreen to distract IT teams while hackers infiltrate systems unnoticed.

How to Protect Against DDoS Attacks

No silver bullet exists, but these steps can help:

  • Use a Content Delivery Network (CDN) or DDoS Mitigation Tools: These distribute traffic globally, preventing overload.

  • Deploy a Web Application Firewall (WAF): It identifies and blocks malicious traffic before it hits the server.

  • Rate limiting: Put restrictions on the number of requests that servers can accept from an IP address during a specified timeframe.

  • Monitor Traffic in Real Time: Keep an eye on unusual traffic spikes or patterns.

  • Prepare an Incident Response Plan: Have a strategy to minimize damage and recover quickly in the event of an attack.


Being proactive is your best bet for keeping systems resilient against these overwhelming attacks.

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Top 4 FAQs

Motivations vary. Threat actors might aim to cause financial loss, protest an organization, or mask more extensive cyber operations.

Not entirely. However, deploying strong defenses, like firewalls and CDNs, can significantly reduce their risk and impact.

Not exactly. DDoS disrupts services, while hacking often involves unauthorized access to systems or data. They can happen separately or together.

The duration varies. Some last minutes, while others can persist for weeks. The attack's longevity often depends on the attacker’s resources and motivation.

Glitch effect

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